ADP5050ACPZ-R7 datasheet(2/60 Pages) AD

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ADP5050

Data Sheet

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TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Typical Application Circuit ............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 3

Detailed Functional Block Diagram .............................................. 4

Specifications..................................................................................... 5

Buck Regulator Specifications .................................................... 6

LDO Regulator Specifications .................................................... 8

I2C Interface Timing Specifications ........................................... 9

Absolute Maximum Ratings.......................................................... 10

Thermal Resistance .................................................................... 10

ESD Caution................................................................................ 10

Pin Configuration and Function Descriptions........................... 11

Typical Performance Characteristics ........................................... 13

Theory of Operation ...................................................................... 19

Buck Regulator Operational Modes......................................... 19

Adjustable and Fixed Output Voltages .................................... 20

Dynamic Voltage Scaling (DVS) .............................................. 20

Internal Regulators (VREG and VDD) ................................... 20

Separate Supply Applications.................................................... 20

Low-Side Device Selection........................................................ 21

Bootstrap Circuitry .................................................................... 21

Active Output Discharge Switch .............................................. 21

Precision Enabling...................................................................... 21

Oscillator ..................................................................................... 21

Synchronization Input/Output ................................................. 22

Soft Start ...................................................................................... 23

Parallel Operation....................................................................... 23

Startup with Precharged Output .............................................. 23

Current-Limit Protection .......................................................... 24

Frequency Foldback ................................................................... 24

Hiccup Protection ...................................................................... 24

Latch-Off Protection.................................................................. 24

Undervoltage Lockout (UVLO) ............................................... 25

Power-Good Function ............................................................... 25

Interrupt Function...................................................................... 25

Thermal Shutdown .................................................................... 26

Overheat Detection.................................................................... 26

Low Input Voltage Detection.................................................... 26

LDO Regulator ........................................................................... 26

I2C Interface .................................................................................... 27

SDA and SCL Pins...................................................................... 27

I2C Addresses .............................................................................. 27

Self-Clear Register Bits .............................................................. 27

I2C Interface Timing Diagrams ................................................ 28

Applications Information .............................................................. 29

ADIsimPower Design Tool ....................................................... 29

Programming the Adjustable Output Voltage........................ 29

Voltage Conversion Limitations............................................... 29

Current-Limit Setting ................................................................ 29

Soft Start Setting......................................................................... 30

Inductor Selection ...................................................................... 30

Output Capacitor Selection....................................................... 30

Input Capacitor Selection.......................................................... 31

Low-Side Power Device Selection............................................ 31

Programming the UVLO Input................................................ 31

Compensation Components Design ....................................... 32

Power Dissipation....................................................................... 32

Junction Temperature ................................................................ 33

Design Example .............................................................................. 34

Setting the Switching Frequency.............................................. 34

Setting the Output Voltage........................................................ 34

Setting the Current Limit .......................................................... 34

Selecting the Inductor................................................................ 34

Selecting the Output Capacitor ................................................ 35

Selecting the Low-Side MOSFET............................................. 35

Designing the Compensation Network................................... 35

Selecting the Soft Start Time..................................................... 35

Selecting the Input Capacitor ................................................... 35

Recommended External Components .................................... 36

Circuit Board Layout Recommendations ................................... 37

Typical Application Circuits ......................................................... 38

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